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For Sale: 6.6 X 6.6 ND3 Filter


David Moe

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ND3 or N3 is the correct designation, meaning point 3 or absorbing one stop. So, ND6 for 2stops, ND9 for three. If an ND really had a density of 3.0 (I suppose the designation would be ND30) it would absorb ten stops. Maybe handy for the surface of Mercury, but not needed anywhere on this planet.

By way of demonstration, here's the engraving on a Tiffen 85N6.

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